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In maths, what is aleph-zero?

the cardinality of the set of all countable ordinal numbers
the cardinality of the set of all natural numbers
the base value of the natural logarithm
the cardinality of the set of real numbers
The aleph numbers are a sequence of numbers used to represent the cardinality of infinite sets that can be well-ordered. The cardinality of the natural numbers is aleph-zero, the next larger cardinality is aleph-one, then aleph-two and so on. The concept and notation are due to Georg Cantor, who defined the notion of cardinality and realized that infinite sets can have different cardinalities.
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Answers by country

the cardinality of the set of all countable ordinal numbers
the cardinality of the set of all natural numbers
the base value of the natural logarithm
the cardinality of the set of real numbers
answers
flagthe United States
17%
48%
20%
13%
129
flagAustralia
9%
41%
35%
12%
31
flagPakistan
8%
41%
33%
16%
12
flagCanada
20%
40%
30%
0%
10
flagPoland
25%
38%
17%
17%
4410
flagthe Netherlands
35%
35%
25%
5%
20
flagthe United Kingdom
18%
32%
25%
23%
86
flagRepublic of Ireland
18%
31%
18%
31%
16
flagMalaysia
30%
30%
30%
10%
10
flagIndia
26%
29%
29%
10%
94
flagGermany
22%
27%
31%
16%
400
flagFrance
33%
25%
33%
8%
12
flagAustria
13%
23%
43%
19%
51
flagSwitzerland
33%
18%
25%
20%
48
flagGreece
28%
14%
28%
28%
14

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